import requests, re, random

user_agent_list = ["Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
                    "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36",
                    "Mozilla/5.0 (Windows NT 10.0; …) Gecko/20100101 Firefox/61.0",
                    "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36",
                    "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.62 Safari/537.36",
                    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36",
                    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)",
                    "Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5; en-US; rv:1.9.2.15) Gecko/20110303 Firefox/3.6.15"]
headers = {
    "User-Agent": random.choice(user_agent_list),
}

p = r'onclick=&#34;moreurl.*?title="(.*?)"'
pattern = re.compile(p, re.S)

def getData(url, i):
    content = requests.get(url, headers=headers).text
    results = re.findall(pattern, content)
    for result in results:
        i = i + 1
        print(i,re.sub('\s','',result))

top = 100
for i in range(0, top, 25):
    url =  "http://book.douban.com/top250?start="+ str(i)
    getData(url, i)